Sumitro, A.R., Salinding, A., Susila, D. and Sutikno, B. 2022. Analysis of the effectiveness of sphenopalatine ganglion block on fentanyl needs in endoscopic endonasal surgery as measured by qNOX score. Bali Medical Journal. 11, 3 (Nov. 2022), 1582–1586. DOI:https://doi.org/10.15562/bmj.v11i3.3869.